A brother asked the question:

I have a non-Muslim friend that I want to introduce to Islam. Is it permissible to bring him to the Masjid, and have him sit at the back and observe the Salaah?

Response:

Respected Brother

With regard to question about bringing a non muslim to the masjid, it is permissible to bring him keeping in mind he is clean from all major impurities.

May Allah reward you for your efforts.